▎ 摘　　要

NOVELTY - Gas-sensitive material comprises a carbon material metal oxide composite nano material formed by a composite of carbon material and metal oxide, where content of carbon material in carbon material metal oxide composite nanomaterial is 0.5-20 wt.%, and content of metal oxide is 80-99.5 wt.%, where metal oxide comprises tungsten oxide and more than one tin oxide, iron oxide, titanium oxide, copper oxide, molybdenum oxide and zinc oxide, and metal oxide is formed on the carbon material in the form of nanowires, and nanowires are tungsten oxide doped nanowires. USE - The gas-sensitive material is useful in self-heating gas sensor based on Joule principle (claimed). ADVANTAGE - The material has reduced resistance, is capable of responding to various gases at a reduced working temperature, obviates the need for external heating, implements self-heating simply by joule heating of a measuring circuit, and has reduced power consumption and increased sensitivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing gas sensitive material, comprising heat treating carbon material and metal oxide and/or metal oxide precursor in microwave and then subjecting to solid-liquid separation in the presence of an alcohol solvent to obtain the carbon material metal oxide composite nanomaterial, where metal oxide comprises tungsten oxide and more than one tin oxide, iron oxide, titanium oxide, copper oxide, molybdenum oxide and zinc oxide. The metal oxide precursor is alcohol-soluble tungsten salt and alcohol-soluble tin salt, alcohol-soluble iron salt, alcohol-soluble titanium salt, alcohol-soluble copper salt, more than one alcohol-soluble molybdenum salt and alcohol-soluble zinc salt; and (2) self-heating gas sensor based on the Joule principle, comprising chip carrier and a gas sensitive material loaded on the chip carrier. The gas-sensitive material is the gas-sensitive material for a self-heating gas sensor based on the Joule principle.